ADDX

ADDX is a Singapore-headquartered digital securities exchange and private-markets investment platform, licensed by the Monetary Authority of Singapore for the issuance, custody and secondary trading of digital securities. Founded in 2017 as iSTOX, it tokenises and fractionalises private equity, private credit, hedge funds, structured products, fixed income and commercial paper so accredited investors can subscribe at roughly USD 10,000 rather than institutional minimums. Alongside the consumer web and mobile app, ADDX Advantage packages the same rails for wealth managers, brokers and external asset managers (EAMs), and the publicly documented ADDX Open API — an HMAC-signed REST surface of about 68 operations covering account and investor information, STO subscription and redemption, wallet, fiat and digital-asset flows, exchange order-book market data and investor reporting — lets those partners drive the platform from their own systems.

ADDX publishes 1 API on the APIs.io network. Tagged areas include Digital Securities Exchange, Private Markets, Tokenization, Alternative Investments, and Wealth Management.

ADDX’s developer surface includes API reference, documentation, getting-started guide, signup flow, support, engineering blog, authentication, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub

27.4/100 thin Agent 11/100 agent aware Full breakdown ↓
scored 2026-09-07 · rubric v0.20.0

1 APIs

Digital Securities ExchangePrivate Markets Tokenization Alternative Investments Wealth Management Capital Markets Fintech Digital Assets Investment Platform Singapore

Kin Score

Kin Score How this is scored →
scored 2026-09-07 · rubric v0.20.0

Composite quality — 27.4/100 · thin

Contract Quality 0.0 / 25

Developer Ergonomics 11.4 / 20

Access Clarity 7.1 / 20

Operational Transparency 0.0 / 13

Contract Governance 2.2 / 12

Discoverability 6.7 / 10

Agent readiness — 11/100 · agent aware

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/addx: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

ADDX Open API

Publicly documented REST API that connects an external system to the ADDX platform. Roughly 68 operations across five documented groups — Account Management (account, balance, E...

Pricing Plans 1

Published pricing tiers and plan structures.

Addx Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Addx Rate Limits

0 limits

RATE LIMITS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Addx Authentication

1 scheme

SECURITY

Addx Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

APIReference

APIReference

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

X-MCPServerCandidate

X-MCPServerCandidate

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance

Conventions

ErrorCatalog

Lifecycle

DataModel

Build 1

SDKs, sample code, and the tooling you integrate with

Packages

Packages

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Compliance

Compliance

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: addx
name: ADDX
description: ADDX is a Singapore-headquartered digital securities exchange and private-markets investment platform, licensed
  by the Monetary Authority of Singapore for the issuance, custody and secondary trading of digital securities. Founded in
  2017 as iSTOX, it tokenises and fractionalises private equity, private credit, hedge funds, structured products, fixed income
  and commercial paper so accredited investors can subscribe at roughly USD 10,000 rather than institutional minimums. Alongside
  the consumer web and mobile app, ADDX Advantage packages the same rails for wealth managers, brokers and external asset
  managers (EAMs), and the publicly documented ADDX Open API — an HMAC-signed REST surface of about 68 operations covering
  account and investor information, STO subscription and redemption, wallet, fiat and digital-asset flows, exchange order-book
  market data and investor reporting — lets those partners drive the platform from their own systems.
image: https://www.addx.co/images/Social_Share_Hero_image2.png
url: https://raw.githubusercontent.com/api-evangelist/addx/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-09-07'
modified: '2026-09-07'
tags:
- Digital Securities Exchange
- Private Markets
- Tokenization
- Alternative Investments
- Wealth Management
- Capital Markets
- Fintech
- Digital Assets
- Investment Platform
- Singapore
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: ADDX Open API
  description: Publicly documented REST API that connects an external system to the ADDX platform. Roughly 68 operations across
    five documented groups — Account Management (account, balance, EAM investor, portfolio, transaction and wallet detail,
    plus STO subscription, subsequent-subscription and redemption flows for both self and EAM-managed investors), Market Data
    (aggregated order book, market depth, market state, token list, ticker feed, trade feed, account balances on the trading
    engine), Reporting (report types, report listing, downloads), Fiat Flow (bank-account management, document upload, fiat
    deposit and withdrawal with OTP confirmation, wealth-manager distribute/collect) and Digital Assets (balances, deposit
    addresses, withdrawal fees, email and mobile OTP, identity verification, withdrawal confirmation). Requests are signed
    with an HMAC-SHA256 X-Signature over the timestamp and HTTP method using a Key ID and secret passphrase the user generates
    in the platform's API Settings. The base URL is deliberately not published — ADDX issues it per environment and per use
    case on request — so the documented paths are relative to a host only a provisioned partner holds.
  humanURL: https://api-docs.addx.co/open-api/
  image: https://www.addx.co/images/Social_Share_Hero_image2.png
  tags:
  - Digital Securities Exchange
  - Private Markets
  - Wealth Management
  - Digital Assets
  - Capital Markets
  properties:
  - type: APIReference
    url: https://api-docs.addx.co/open-api/
  - type: Authentication
    url: authentication/addx-authentication.yml
  - type: Conventions
    url: conventions/addx-conventions.yml
  - type: ErrorCatalog
    url: errors/addx-problem-types.yml
  - type: Lifecycle
    url: lifecycle/addx-lifecycle.yml
  - type: RateLimits
    url: rate-limits/addx-rate-limits.yml
  - type: DataModel
    url: data-model/addx-data-model.yml
  - type: X-MCPServerCandidate
    url: mcp/addx-mcp.yml
common:
- type: DomainSecurity
  url: security/addx-domain-security.yml
- type: Website
  url: https://addx.co/
- type: DeveloperPortal
  url: https://api-docs.addx.co/open-api/
- type: APIReference
  url: https://api-docs.addx.co/open-api/
- type: Documentation
  url: https://addx.co/en/how-addx-works/
- type: GettingStarted
  url: https://addx.co/en/get-started/
- type: SignUp
  url: https://client.addx.co/register
- type: Login
  url: https://client.addx.co/login
- type: Support
  url: https://addx.co/en/contact-us/
- type: Blog
  url: https://addx.co/en/insights/
- type: TermsOfService
  url: https://documents.addx.co/ADDX_Platform_Rules.pdf
- type: PrivacyPolicy
  url: https://addx.co/en/privacy-policy/
- type: Conformance
  url: conformance/addx-conformance.yml
- type: Compliance
  url: conformance/addx-conformance.yml
- type: Authentication
  url: authentication/addx-authentication.yml
- type: Conventions
  url: conventions/addx-conventions.yml
- type: ErrorCatalog
  url: errors/addx-problem-types.yml
- type: Lifecycle
  url: lifecycle/addx-lifecycle.yml
- type: RateLimits
  url: rate-limits/addx-rate-limits.yml
- type: Plans
  url: plans/addx-plans-pricing.yml
- type: Packages
  url: packages/addx-packages.yml
- type: DataModel
  url: data-model/addx-data-model.yml
- type: LLMsTxt
  url: llms/addx-llms.txt
- type: X-MCPServerCandidate
  url: mcp/addx-mcp.yml
x-enrichment:
  date: '2026-09-07'
  status: enriched
  artifacts_added: 13
  pass: local-v3

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